title: Spectroscopy of systems with time variable parameters: photoreflectance of GaAs(001) under cesium adsorption.
abstract: A modification of photoreflectance spectroscopy, which improves the precision and efficiency of measuring time-evolving surface electric fields, is proposed. This modification is explored for studying the band bending evolution under cesium adsorption on the reconstructed GaAs(001) surface and relaxation processes in the non-equilibrium adsorbate overlayer. Observation of several distinct maxima and minima in the coverage dependence of the band bending can be explained by the formation of adatom-induced surface states with a quasi-discrete spectrum.
authors.affiliation: Institute of Semiconductor Physics, Prospekt Lavrentieva, 13, 630090 Novosibirsk, Russia.
authors.forename: A G
authors.initials: AG
authors.lastname: Zhuravlev
authors.forename: H E
authors.initials: HE
authors.lastname: Scheibler
authors.forename: A S
authors.initials: AS
authors.lastname: Jaroshevich
authors.forename: V L
authors.initials: VL
authors.lastname: Alperovich